Hey everyone! I'm looking to build a Peltier-based refrigerator since my student accommodation doesn't allow traditional fridges. I know these modules aren't very efficient, but I'm willing to give it a shot because I don't want to deal with a compressor. Plus, I don't really mind the energy usage since I don't pay for electricity. I've got a CPU heatsink with a fan to cool the hot side and it's working pretty well - the cold side actually goes below zero and forms ice! I've done a little research, like watching a video that pokes fun at Peltier mini-fridges, but I think I can make this work with good insulation. What I'm wondering is, would a standard camping cooler provide enough insulation if I just cut a hole for the Peltier module? Also, how big can it be before it becomes an issue? Can I push more current through my Peltier modules to achieve better cooling? I'm a bit lost on where to begin. Any advice would be much appreciated!
3 Answers
Honestly, this might not work as well as you hope. The performance of Peltier modules really depends on how much voltage you push through them and how effectively you can dissipate heat from the hot side. You might end up with a setup that's big, noisy, and a potential fire hazard. Have you considered a 12v camping fridge? They can be super compact and work way better than trying to DIY something like this.
Sure, it's totally doable! You’ll need a solid heat exchanger for the cold side and use thermal compound to ensure good contact with your Peltier modules. The real challenge is making sure you have top-notch insulation since the cold and hot sides are pretty close together. High-density insulation foam is what the pros use. Also, look into a temperature controller to manage the cooling better. Don’t just stack the modules without understanding how they work together, it could get complicated.
Condensation could be an issue with your setup. While you might get things to cool down, freezing might be a stretch since Peltier coolers have limitations based on the temperature difference and the heat they can transfer. So it’s something to keep in mind.